Constant crashing error

For the past month the same thing has been happening. Everytime I go to the Mac OS X Software update, clicking on an msn link, using the flip4mac plug-in, open certain video's, go to dashboard etc. My safari or other programs crash. It seems like everytime a new active window is opening safari crashes. Firefox also does the same thing so its not a safari problem i dont think.

Also if I have Safari open and I go to dashboard, safari crashes.
I tried to do a disk repair and cleared my cache, but still nothing.

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